derogatory term for one who is continuously rejected by his so-called 'friends'. commonly used as an insult, swanndog means 'a whale's vagina from millwall', but can also be used to refer to a cross between a swan and a dog.

'oi you, swanndog'
'ere mate, ur such a swanndog'
shit, what is that thing?' 'oh, thats just a swanndog.'